1. Water Availability & Mitigation in Concrete

Concrete lies within the Skagit River Basin, where water availability is governed by Washington State instream flow rules.

Skagit River Basin Mitigation Program

Many parcels in and around Concrete may qualify for water availability through the

Skagit River Basin Mitigation Program.

Eligibility depends on:

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• Parcel location

• Proximity to closed tributaries

• Basin mapping boundaries

• County review
   

Some parcels may require mitigation documentation to obtain a building permit. Others near sensitive tributaries may require additional review or alternative water strategies.

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We assist property owners by:

• Reviewing parcel status

• Evaluating mitigation applicability

• Filing the required 72-hour Notice of Intent (NOI)

• Coordinating documentation for county permitting
   

Each property must be evaluated individually.

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2. Concrete Geology: Glacial Outwash & Fractured Rock

Drilling in Concrete is very different from drilling in the lower valley.

Valley Floor (Skagit River Corridor)

Near the river, we often encounter:

• Deep glacial outwash

• Large granite “floaters”

• Sand and gravel layers

• Dense blue-gray clay lenses
   

Typical valley floor wells:

• Depth: 80–120 feet

• Yield: Often 10–25 GPM
   

Thick clay layers can act as natural protective caps over deeper aquifers.

Hillside & Foothill Properties

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In upland areas and near Lake Tyee or South Skagit Highway, conditions shift to:

• Fractured volcanic and metamorphic bedrock

• Granite and basalt formations

• Lower-yield rock aquifers
   

Typical hillside wells:

• Depth: 250–400+ feet

• Yield: Often 5–15 GPM
   

These wells rely on intersecting water-bearing fractures and require air-rotary drilling techniques.

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3. Common Upper Skagit Water Challenges

Low pH (Acidic Water)

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Mountain-influenced groundwater can be slightly acidic, which may corrode copper plumbing over time. Calcite neutralizing filters help balance pH and protect your home.

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Iron & Hydrogen Sulfide

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Some Concrete wells produce iron staining or sulfur odor (“rotten egg” smell). Filtration and oxidation systems can effectively correct these issues.

Glacial Silt

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In areas near the river, fine sediment (“glacial flour”) may appear during development. Proper gravel packing and well development techniques are essential to prevent pump wear.

Rural Power Fluctuations

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Upper Skagit properties may experience voltage fluctuations during storms. Surge protection and properly sized pump systems help prevent premature equipment failure.

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4. Typical Well Performance in Concrete

While each parcel is unique, common ranges include:

Valley Properties:

• Depth: 80–120 ft

• Static water level: Often 40–100 ft

• Yield: 10–25+ GPM
   

Hillside / Rock Properties:

• Depth: 250–400+ ft

• Static water level: Often 60–150+ ft

• Yield: 5–15 GPM
   

Lower-yield rock wells can be paired with:

• Atmospheric storage tanks

• Booster pump systems

• Constant pressure controls
   

to ensure reliable household performance.